'use strict'

class content {

  constructor () {
    //param默认就是/:id，若要改变路由，则可以设置此属性，比如设置为/:name
    //this.param = '/:id'
  }

  //以下方法，若不需要，要去掉，避免无意义的路由。

  //获取资源具体内容
  // 对应的路由 GET /content/:id
  async get (c) {
    let sqltext = `SELECT * FROM content WHERE id=$1`

    let r = await c.service.psql.query(sqltext, [c.param.id])

    if (r.rowCount === 0) {
        return c.status(404).send('content not found')
    }
    // 返回点击的列表信息
    c.send(r.rows[0])
  }

  //创建资源
  // 对应的路由 POST /content/:id
  async post (c) {
    try {
      //提交的body数据通过c.body获取
      let data = JSON.parse(c.body)

      let sqltext = `INSERT INTO content(id,add_time,detail,title,update_time) `
          + ` VALUES ($1,$2,$3,$4,$5)`

      // 生成唯一ID
      let id = c.helper.makeId()//助手函数
      let tm = Date.now()

      let r = await c.service.psql.query(sqltext, [id, tm, data.detail, data.title, tm])

      //没有成功向数据表里插入数据
      if (r.rowCount === 0) {
          return c.status(500).send('failed')
      }

      // 如果成功插入，返回唯一ID值
      c.send(id)
  } catch (err) {
      c.status(400).send('it is not json data')
  }
  }

  //更新资源
  // 对应的路由 PUT /content/:id
  // async put (c) {

  // }

  //获取列表
  // 对应的路由 GET /content/:id
  async list (c) {
    let ret = await c.service.psql.query(`select * from content`)
    //c.send(ret.rows)等效于c.res.body=ret.rows
    c.send(ret.rows)
  }

  //删除资源
  // 对应的路由 DELETE /content/:id
  async delete (c) {
    let sqltext = `DELETE  FROM content WHERE id=$1`

    let r = await c.service.psql.query(sqltext, [c.param.id])

    if (r.rowCount == 0) {
        return c.status(404).send('content not found')
    }

    c.send(r)
  }

  // 声明要对post和delete请求函数启用此中间件
  __mid(){
    return [
      {
        name:'token-verify',
        path:['post','delete']
      }
    ]
  }

}

module.exports = content
